Knowledge

Flanges Processing Is More Prone To Problems

Flanges forging processing is the metal billet heating temperature is too high or in the high temperature heating zone to stay too long, the furnace oxygen and other oxidizing gases penetrate into the gap between metal grains, and iron, sulfur, Carbon and other oxidation, the formation of fusible oxide co-crystal, destruction of the relationship between the grain, so that the plastic material sharp decline. To burn a serious metal, remove the coarse when the light hit on the crack, pull the long time will appear in the burning cracks.

The brass is cracked on the surface of the Flanges forging. High-power observation, the light yellow copper (or copper solid solution) along the grain boundary distribution. When the Flanges blank is heated, such as the residual copper oxide in the furnace, the oxidized steel is reduced to free copper at high temperature, and the molten steel atoms extend along the austenite grain boundary, weakening the relationship between the grains. In addition, when the amount of copper in the steel is higher [> 2% (mass fraction)], such as heating in an oxidizing atmosphere, forming a copper-rich layer under the iron oxide,

There is no strict temperature boundary between overheating and overheating. Generally to grain oxidation and melting characteristics to determine the burning. For carbon steel, when the grain boundary melting, serious oxidizing die steel (high speed steel, Cr12 steel, etc.) over the burning, the grain boundary due to melting fish bones. When the aluminum alloy burned grain boundary melting triangle and re-melting ball and so on. Forging after burning, often can not be saved, had to scrapped.

The integral Flanges is a Flanges connection. Also belong to the neck with a pair of steel pipe Flanges. Material is carbon steel, stainless steel, alloy steel and so on. In the various domestic standards, with IF to represent the overall Flanges. Used in high pressure pipes. Production process for forging. The overall Flanges products, using 11 processes of precision machining, the surface smooth and smooth, can be in accordance with the US standard ASME, the German standard DIN, the EU label, the Japanese standard and the Chinese standard for custom production.

With the neck butt welding Flanges and the overall Flanges are welded using welding, have a long neck, how to look from the appearance of the size and use of the difference between the neck and the Flanges Flanges Flanges it From the appearance point of view, the overall Flanges tube end than the butt welding Flanges tube thickness, the overall Flanges diameter in addition to PN1.6MPa, DN450 above the rest are the same as the nominal diameter. The overall Flanges of the neck height is high, the thickness of the wall thickness is relatively thick, with the Flanges reference standard can be clearly seen.

From the application point of view, the overall Flanges is connected with the device Flanges, such as the Flanges on the valve, the Flanges and the valve is a whole, not through the welding connection. The overall Flanges used in the manufacture of equipment, in the pipeline design is almost not used. And the neck welding Flanges and the valve, pump and other equipment to connect when used, welded to the pipeline, the tail interface size and the corresponding pipe / pieces of the outer diameter, wall thickness, can be directly welded to the connection.